EP2747949B1 - Portable handheld power tool - Google Patents
Portable handheld power tool Download PDFInfo
- Publication number
- EP2747949B1 EP2747949B1 EP11871729.7A EP11871729A EP2747949B1 EP 2747949 B1 EP2747949 B1 EP 2747949B1 EP 11871729 A EP11871729 A EP 11871729A EP 2747949 B1 EP2747949 B1 EP 2747949B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- power tool
- housing
- fan
- air
- portable handheld
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001816 cooling Methods 0.000 claims description 28
- 239000000428 dust Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B17/00—Chain saws; Equipment therefor
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
- A01G3/04—Apparatus for trimming hedges, e.g. hedge shears
- A01G3/047—Apparatus for trimming hedges, e.g. hedge shears portable
- A01G3/053—Apparatus for trimming hedges, e.g. hedge shears portable motor-driven
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/008—Cooling means
Definitions
- This invention relates to a portable handheld power tool according to the preamble of claim 1.
- US 7 969 116 B2 discloses such portable handheld power tool according to the preamble of claim 1.
- Battery driven hand held power tools such as chain saws and hedge trimmers are well known in the art.
- the tools In order to satisfy demanding consumers and professional users, the tools need powerful motors and high capacity batteries. In such tools, a lot of heat will be produced. Accordingly, there is a need for an arrangement for cooling battery driven power tools in an efficient way.
- the arrangement should be light-weight and require little space, and preferably possible to manufacture at a low cost.
- a portable handheld power tool comprising a housing, an electric motor accommodated in the housing, which electric motor is arranged to drive a working tool of the power tool.
- a battery pack is detachably connected to the housing, which battery pack is arranged to provide electric power to the motor.
- a cooling fan is accommodated in the housing. The cooling fan has a fan wheel and a plurality of blades, and is arranged to generate a flow of air through an air current channel defined by the housing and components therein.
- the air current channel guides the flow of air such that it passes by the motor and through the battery pack, so as to cool the motor and the battery pack, wherein the cooling fan is arranged to suck air from an outside of the housing and to push air through the air current channel so as to generate an overpressure within the housing when the fan is rotating, whereby the overpressure minimizes the risk of dust and other particles getting into the housing through leaking portions of the housing, wherein an air inlet is provided next to the fan. Since the same fan is used for cooling the motor as the battery pack, an efficient way of cooling these components is achieved. Since the air current flows through the battery pack battery, battery cells arranged therein are efficiently cooled. Thanks to the efficient cooling the motor as well as the battery pack, these components may be of high capacity, even though such high capacity components might produce a considerable amount of heat during operation of the tool.
- the power tool furthermore comprises a control unit, disposed in the housing, which control unit is arranged to control a flow of electric current to the motor.
- the control unit is disposed within the housing such that the flow of air generated by the cooling fan also passes by the control unit, so as to cool the control unit.
- the fan wheel of the cooling fan is fixed to a rotation axle of the motor.
- the fan will rotate with the motor, and a rotation that is already present is used to generate a flow of air.
- the cooling fan is arranged to suck air from an outside of the housing and to push air through the air current channel. In that way an adequate flow of air is generated. Since the fan "pushes" air into the housing, an overpressure is created within the housing when the fan is rotating. Such an overpressure minimizes the risk of dust and other particles getting into the housing through leaking portions of the housing.
- the only way air can enter the housing is through the air inlets provided in the housing, next to the fan.
- a filter may be arranged next to the air inlet, so as to minimize the risk of dust and other particles this way.
- the battery pack is arranged within the housing so as to allow the cooling air current to flow from a bottom to a top of the battery pack.
- This configuration might have a positive effect on the air flow, since the air current, which is heated by the motor, control unit and battery, will spontaneously rise towards an upper end of the battery.
- the fan has at least 12 blades connected to the fan wheel. According to another embodiment, the fan has at least 15 blades connected to the fan wheel. Such relatively large number of fan blades is profitable in order to generate a high air pressure by means of the fan.
- the blades are angled relative to a main extension plane of the fan wheel by at least 20 degrees. Such a relatively aggressive angle is profitable in order to generate a high air pressure by means of the fan.
- the blades are angled relative to a main extension plane of the fan wheel by 20-40 degrees.
- the blades are angled relative to a main extension plane of the fan wheel by 33-39 degrees.
- the battery pack is arranged within the housing downstream of the motor such that the cooling air passes the motor before the battery pack.
- the cooling fan is an axial fan.
- the air current will flow in the direction of the shaft about with the fan wheel rotates. Accordingly the loss of flow is reduced as compared to if a radial fan would have been used.
- the power tool is a chain saw. Since chain saws generally require high capacity batteries and motors, the efficient cooling achieved by means of the embodiments herein is highly profitable for chain saws.
- a major part of a battery powered handheld power tool embodied as a chain saw is shown.
- the working tool of the chain saw i.e. the saw chain and the chain supporting guide bar, is omitted in Fig. 1 a.
- the chain saw has a housing 10 in which an electric motor 11, arranged to drive the saw chain, is accommodated.
- An electric motor 11 arranged to drive the saw chain, is accommodated.
- a schematic sectional view of the motor is shown in Fig. 3 .
- the motor may be a BLDC motor.
- the power of the motor is preferably at least 500 W.
- a fan wheel 14a of an axial fan 14 is fixed to the rotation axle 11a or shaft 11a of the motor 11.
- the fan wheel 14a rotates with the motor 11 to produce an air current to cool the motor 11.
- a motor housing defines a closed casing, and the air current passes on an outside of this casing.
- the fan wheel When the fan wheel rotates, it sucks air from the outside of the housing, through air inlets 20, and pushes the air towards the motor such that the motor is cooled.
- a control unit 13 is arranged in the vicinity of the motor 11.
- the control unit is arranged to control the flow of electric current provided to the motor.
- the different components inside the housing are positioned relative each other and the housing such that an air guiding channel is defined, which air guiding channel guides the air via the motor 11, further via the control unit 13, and further towards a battery pack 12.
- the battery pack is arranged in the housing, and is positioned relative to the housing 10 and relative to other components in the housing 10, such that the only way the air current may escape from the housing is through the battery pack 12.
- the battery pack there are air inlets formed, so as to let the air current arriving from the motor and the control unit in.
- air outlets are provided in the opposite end of the battery pack. These outlets are in fluid communication with air outlets 30 provided in the housing, such that the air current may escape from the housing through the housing outlets 30.
- the battery pack is arranged within the housing such that the air inlets of the battery pack are provided in a bottom wall of the battery, and such that the air outlets of the battery pack are provided in a top wall of the battery.
- This configuration might have a positive effect on the air flow, since the air current, which is heated by the motor, control unit and battery, will spontaneously rise towards an upper end of the battery.
- the battery pack is not necessarily completely enclosed by the housing.
- the battery pack is inserted into a transversal through hole defined by the housing, and is enclosed by the housing on four sides only.
- the only way the air current created by the fan can escape from the housing to the outside is via the battery pack.
- the air inlets provided in the lower end of it will match with outlets provided in one of the housing walls surrounding the through hole.
- the air outlets provided in the upper end of the battery pack will match with air inlets provided in another one of the housing walls surrounding the through hole.
- the battery pack may be connected to the housing in one end only, in a way securing that the cooling air current has to pass through the battery pack in order to find its way out to the surroundings.
- Fig. 5 is a schematic view of a flow of air through a chain saw housing, according to an embodiment of the invention.
- the fan is an axial fan. This means that it forces air to move in parallel to the shaft 11a about which the fan wheel and blades rotate.
- air will flow in an axial direction of the motor, along the sides of the motor. In that way, an efficient cooling of the motor is achieved.
- the fan wheel has a main extension plane which is parallel to the plane of the paper in Figs. 1 band 2c.
- Fan blades 14b are arranged around a periphery of the fan wheel. It has been noticed that a relatively large number of fan blades is advantageous in order to provide a suitable air pressure as the fan wheel and blades rotate..
- the number of fan blades is preferably more than 12, and more preferably more than 15.
- the inclination angle of the fan blades relative to the main extension plane of the fan wheel is about 36 degrees.
- an overpressure is created within the tool housing.
- Such an overpressure minimizes the risk of dust and other particles getting into the housing through leaking portions of the housing.
- the only way air can enter the housing is through the air inlets 20 provided in the housing, next to the fan.
- a filter may be arranged next to the air inlet, so as to minimize the risk of dust and other particles this way.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forests & Forestry (AREA)
- Wood Science & Technology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental Sciences (AREA)
- Portable Power Tools In General (AREA)
- Secondary Cells (AREA)
Description
- This invention relates to a portable handheld power tool according to the preamble of claim 1.
US 7 969 116 B2 discloses such portable handheld power tool according to the preamble of claim 1. - Battery driven hand held power tools, such as chain saws and hedge trimmers are well known in the art.
- During operation of a battery driven tool, heat is produced in the motor as well as in the battery. The more powerful the motor and battery are, the more heat is produced. The heat has to be evacuated from the tool.
- In order to satisfy demanding consumers and professional users, the tools need powerful motors and high capacity batteries. In such tools, a lot of heat will be produced. Accordingly, there is a need for an arrangement for cooling battery driven power tools in an efficient way. The arrangement should be light-weight and require little space, and preferably possible to manufacture at a low cost.
- It is the object of the present invention to provide a portable handheld power tool according to claim 1 in which heat producing and sensitive components are efficiently cooled during operation. According to the invention as disclosed in claim 1, this object is achieved by means of a portable handheld power tool comprising a housing, an electric motor accommodated in the housing, which electric motor is arranged to drive a working tool of the power tool. A battery pack is detachably connected to the housing, which battery pack is arranged to provide electric power to the motor. A cooling fan is accommodated in the housing. The cooling fan has a fan wheel and a plurality of blades, and is arranged to generate a flow of air through an air current channel defined by the housing and components therein. The air current channel guides the flow of air such that it passes by the motor and through the battery pack, so as to cool the motor and the battery pack, wherein the cooling fan is arranged to suck air from an outside of the housing and to push air through the air current channel so as to generate an overpressure within the housing when the fan is rotating, whereby the overpressure minimizes the risk of dust and other particles getting into the housing through leaking portions of the housing, wherein an air inlet is provided next to the fan. Since the same fan is used for cooling the motor as the battery pack, an efficient way of cooling these components is achieved. Since the air current flows through the battery pack battery, battery cells arranged therein are efficiently cooled. Thanks to the efficient cooling the motor as well as the battery pack, these components may be of high capacity, even though such high capacity components might produce a considerable amount of heat during operation of the tool.
- According to an embodiment of the solution, the power tool furthermore comprises a control unit, disposed in the housing, which control unit is arranged to control a flow of electric current to the motor. The control unit is disposed within the housing such that the flow of air generated by the cooling fan also passes by the control unit, so as to cool the control unit. By using one single fan for cooling all these three components, an even more efficient and cost efficient cooling solution is achieved.
- According to another embodiment of the solution, the fan wheel of the cooling fan is fixed to a rotation axle of the motor. Thereby, the fan will rotate with the motor, and a rotation that is already present is used to generate a flow of air. This is a simple and cost efficient solution which requires little space.
- According to yet another embodiment the cooling fan is arranged to suck air from an outside of the housing and to push air through the air current channel. In that way an adequate flow of air is generated. Since the fan "pushes" air into the housing, an overpressure is created within the housing when the fan is rotating. Such an overpressure minimizes the risk of dust and other particles getting into the housing through leaking portions of the housing. The only way air can enter the housing is through the air inlets provided in the housing, next to the fan. A filter may be arranged next to the air inlet, so as to minimize the risk of dust and other particles this way.
- According to another embodiment, the battery pack is arranged within the housing so as to allow the cooling air current to flow from a bottom to a top of the battery pack. This configuration might have a positive effect on the air flow, since the air current, which is heated by the motor, control unit and battery, will spontaneously rise towards an upper end of the battery.
- According to another embodiment, the fan has at least 12 blades connected to the fan wheel. According to another embodiment, the fan has at least 15 blades connected to the fan wheel. Such relatively large number of fan blades is profitable in order to generate a high air pressure by means of the fan.
- According to an embodiment, the blades are angled relative to a main extension plane of the fan wheel by at least 20 degrees. Such a relatively aggressive angle is profitable in order to generate a high air pressure by means of the fan.
- According to an embodiment the blades are angled relative to a main extension plane of the fan wheel by 20-40 degrees.
- According to an embodiment, the blades are angled relative to a main extension plane of the fan wheel by 33-39 degrees.
- According to another embodiment the battery pack is arranged within the housing downstream of the motor such that the cooling air passes the motor before the battery pack. This is a simple and cost-efficient solution, since it is simple to connect the fan to the motor.
- According to an embodiment, the cooling fan is an axial fan. Thereby, the air current will flow in the direction of the shaft about with the fan wheel rotates. Accordingly the loss of flow is reduced as compared to if a radial fan would have been used.
- According to an embodiment the power tool is a chain saw. Since chain saws generally require high capacity batteries and motors, the efficient cooling achieved by means of the embodiments herein is highly profitable for chain saws.
- As used herein the following terms have the following meanings:
- The terms downwards, upwards, bottom and top are defined based on a horizontal support surface on which the tool may be positioned.
- The invention will be understood and appreciated more fully from the following detailed description, taken in conjunction with the drawings, in which:
-
Fig. 1a is a partial perspective view of top handle chain saw according to an embodiment of the invention, -
Fig. 1b is a cross section of the chain saw shown inFig. 1 a, -
Fig. 2a is a perspective view of a fan wheel and fan blades according to an embodiment of the invention, -
Fig. 2b is a side view of a fan wheel ofFig. 2a , -
Fig. 2c is a top view of the fan wheel ofFigs 2a and 2b , -
Fig. 3 is a schematic cross sectional view of a chain saw housing, showing a flow of air passing by the motor and the control unit. -
Fig. 4 is a schematic cross sectional view illustrating a flow of air passing by the motor and further through the battery pack. -
Fig. 5 is a schematic flow chart, showing a flow of air through a chain saw housing. - The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, like numbers refer to like elements.
- Referring to
Fig. 1a , a major part of a battery powered handheld power tool embodied as a chain saw is shown. The working tool of the chain saw, i.e. the saw chain and the chain supporting guide bar, is omitted inFig. 1 a. - The chain saw has a
housing 10 in which anelectric motor 11, arranged to drive the saw chain, is accommodated. A schematic sectional view of the motor is shown inFig. 3 . - The motor may be a BLDC motor.
- Other types of electric motors are also possible, such as a PMDC motor.
- In the case of a battery driven chain saw, the power of the motor is preferably at least 500 W.
- A
fan wheel 14a of anaxial fan 14 is fixed to therotation axle 11a orshaft 11a of themotor 11. Thefan wheel 14a rotates with themotor 11 to produce an air current to cool themotor 11. - In the power tool 1 shown in the figures herein, a motor housing defines a closed casing, and the air current passes on an outside of this casing.
- When the fan wheel rotates, it sucks air from the outside of the housing, through
air inlets 20, and pushes the air towards the motor such that the motor is cooled. - In the embodiment shown in
Fig. 3 , acontrol unit 13 is arranged in the vicinity of themotor 11. The control unit is arranged to control the flow of electric current provided to the motor. - When the cooling air has passed the motor, it is guided so as to pass by the control unit, such that the control unit is also cooled.
- The different components inside the housing are positioned relative each other and the housing such that an air guiding channel is defined, which air guiding channel guides the air via the
motor 11, further via thecontrol unit 13, and further towards abattery pack 12. - In the embodiments shown in the figures herein, the battery pack is arranged in the housing, and is positioned relative to the
housing 10 and relative to other components in thehousing 10, such that the only way the air current may escape from the housing is through thebattery pack 12. - In one end the battery pack there are air inlets formed, so as to let the air current arriving from the motor and the control unit in. In the opposite end of the battery pack, air outlets are provided. These outlets are in fluid communication with
air outlets 30 provided in the housing, such that the air current may escape from the housing through thehousing outlets 30. - In the embodiment shown in
Fig. 1b , the battery pack is arranged within the housing such that the air inlets of the battery pack are provided in a bottom wall of the battery, and such that the air outlets of the battery pack are provided in a top wall of the battery. - This configuration might have a positive effect on the air flow, since the air current, which is heated by the motor, control unit and battery, will spontaneously rise towards an upper end of the battery.
- The battery pack is not necessarily completely enclosed by the housing. In the embodiment shown in
Fig. 1a , the battery pack is inserted into a transversal through hole defined by the housing, and is enclosed by the housing on four sides only. However, the only way the air current created by the fan can escape from the housing to the outside is via the battery pack. When the battery pack is inserted in the through hole, the air inlets provided in the lower end of it will match with outlets provided in one of the housing walls surrounding the through hole. Correspondingly, the air outlets provided in the upper end of the battery pack will match with air inlets provided in another one of the housing walls surrounding the through hole. These inlets in a housing wall surrounding the through hole are in fluid communication with thehousing air outlets 30, so as to allow the air current to flow from the battery pack, further through a portion of the housing arranged above the battery pack, and out to the surroundings. In this way, it is secured that the only way the air current can find its way to the surroundings of the housing is through the battery pack. - According to other possible embodiments, the battery pack may be connected to the housing in one end only, in a way securing that the cooling air current has to pass through the battery pack in order to find its way out to the surroundings.
-
Fig. 5 is a schematic view of a flow of air through a chain saw housing, according to an embodiment of the invention. - According to the embodiment shown in
Figures 1b and2a-2c , the fan is an axial fan. This means that it forces air to move in parallel to theshaft 11a about which the fan wheel and blades rotate. When the fan is fixed to the rotation shaft of the motor, air will flow in an axial direction of the motor, along the sides of the motor. In that way, an efficient cooling of the motor is achieved. - The fan wheel has a main extension plane which is parallel to the plane of the paper in
Figs. 1 band 2c. -
Fan blades 14b are arranged around a periphery of the fan wheel. It has been noticed that a relatively large number of fan blades is advantageous in order to provide a suitable air pressure as the fan wheel and blades rotate.. - The number of fan blades is preferably more than 12, and more preferably more than 15.
- In the embodiment shown in
Figs. 2a-2c , 18 fan blades are arranged around the fan wheel. - It has been noticed that arranging the fan blades such that they are inclined relative to the main extension plane of the fan wheel by a relatively aggressive angle might be advantageous. An inclination angle of about 33-39 degrees to could be particularly beneficial.
- In the embodiment shown in
Figs. 2a-2c , the inclination angle of the fan blades relative to the main extension plane of the fan wheel is about 36 degrees. - As the fan wheel rotates, an overpressure is created within the tool housing. Such an overpressure minimizes the risk of dust and other particles getting into the housing through leaking portions of the housing. The only way air can enter the housing is through the
air inlets 20 provided in the housing, next to the fan. A filter may be arranged next to the air inlet, so as to minimize the risk of dust and other particles this way. - In the drawings and specification, there have been disclosed preferred embodiments and examples of the invention and, although specific terms are employed, they are used in a generic and descriptive sense only and not for the purpose of limitation, the scope of the invention being set forth in the following claims.
Claims (15)
- A portable handheld power tool comprisinga housing (10);an electric motor (11) accommodated in the housing (10), which electric motor (11) is arranged to drive a working tool of the power tool (1);a battery pack (12) detachably connected to the housing, which battery pack (12) is arranged to provide electric power to the motor (11);a cooling fan (14) accommodated in the housing, the cooling fan (14) having a fan wheel (14a) and a plurality of blades (14b), wherein the cooling fan (14) is arranged to generate a flow of air through an air current channel defined by the housing and components therein, which air current channel guides the flow of air such that it passes by the motor (11) and through the battery pack (12), so as to cool the motor (11) and the battery pack (12), characterized in that the cooling fan is arranged to suck air from an outside of the housing and to push air through the air current channel so as to generate an overpressure within the housing when the fan is rotating, whereby the overpressure minimizes the risk of dust and other particles getting into the housing through leaking portions of the housing, wherein the air inlet is provided next to the fan (14).
- The portable handheld power tool according to claim 1 wherein a filter is arranged next to the air inlet, so as to minimize the risk of dust and other particles entering the housing.
- The portable handheld power tool according to claim 1, which power tool furthermore comprisesa control unit (13), disposed in the housing (10), which control unit (13) is arranged to control a flow of electric current to the motor (11);wherein the control unit (13) is disposed within the housing (10) such that the flow of air generated by the cooling fan (14) also passes by the control unit, so as to cool the control unit.
- The portable handheld power tool according to claim 1, wherein the fan wheel (14a) of the cooling fan (14) is fixed to a rotation axle (11a) of the motor (11).
- The portable handheld power tool according to any of the preceding claims, wherein the battery pack is arranged within the housing so as to allow the cooling air current to flow from a bottom to a top of the battery pack, when the power tool is in a normal working position.
- The portable handheld power tool according to any of the preceding claims, wherein the fan (14) has at least 12 blades (14b) connected to the fan wheel (14a).
- The portable handheld power tool according to any of the preceding claims, wherein the fan (14) has at least 15 blades (14b) connected to the fan wheel (14a).
- The portable handheld power tool according to any of the preceding claims, wherein the blades are angled relative to a main extension plane of the fan wheel by at least 20 degrees.
- The portable handheld power tool according to any of the preceding claims, wherein the blades are angled relative to a main extension plane of the fan wheel by 20-40 degrees.
- The portable handheld power tool according to any of the preceding claims, wherein the blades are angled relative to a main extension plane of the fan wheel by 33-39 degrees.
- The power tool according to any of the preceding claims, wherein the battery pack (12) is arranged within the housing downstream of the motor (11) such that the cooling air passes the motor before the battery pack.
- The portable handheld power tool according to any of the preceding claims, wherein the cooling fan is an axial fan.
- The portable handheld power tool according to any of the preceding claims, which power tool is a chain saw.
- The portable handheld power tool according to any of the preceding claims, which power tool is a top handle chain saw.
- The portable handheld power tool according to any of the preceding claims, which power tool is a rear handle chain saw.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/SE2011/051028 WO2013032372A1 (en) | 2011-08-26 | 2011-08-26 | Battery driven handheld tool |
Publications (3)
Publication Number | Publication Date |
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EP2747949A1 EP2747949A1 (en) | 2014-07-02 |
EP2747949A4 EP2747949A4 (en) | 2015-03-25 |
EP2747949B1 true EP2747949B1 (en) | 2017-11-01 |
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Application Number | Title | Priority Date | Filing Date |
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EP11871729.7A Active EP2747949B1 (en) | 2011-08-26 | 2011-08-26 | Portable handheld power tool |
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EP (1) | EP2747949B1 (en) |
WO (1) | WO2013032372A1 (en) |
Cited By (1)
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US20210299844A1 (en) * | 2018-08-31 | 2021-09-30 | Husqvarna Ab | Power tool |
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WO2016150518A1 (en) | 2015-03-26 | 2016-09-29 | Husqvarna Ab | Visible motor saw head layout |
CN105057787A (en) * | 2015-08-18 | 2015-11-18 | 包头市北工机械有限公司 | Intelligent electric chain saw |
US10328566B2 (en) * | 2015-10-14 | 2019-06-25 | Black & Decker Inc. | Brushless motor system for power tools |
JP6979374B2 (en) * | 2018-02-26 | 2021-12-15 | 株式会社やまびこ | Electric work machine |
JP7406940B2 (en) * | 2019-08-13 | 2023-12-28 | 株式会社やまびこ | electric work equipment |
JP7340385B2 (en) * | 2019-08-13 | 2023-09-07 | 株式会社やまびこ | electric work equipment |
EP3825065B8 (en) * | 2019-11-19 | 2024-05-29 | Andreas Stihl AG & Co. KG | Battery-powered tool with cooling air guidance |
WO2021107827A1 (en) * | 2019-11-25 | 2021-06-03 | Husqvarna Ab | A hand-held electrically powered work tool |
WO2021104723A1 (en) * | 2019-11-25 | 2021-06-03 | Husqvarna Ab | A hand-held electrically powered work tool |
FR3106953B1 (en) * | 2020-02-12 | 2022-04-01 | Innovation Fabrication Commercialisation Infaco | Forced ventilation pruner |
CN111730644A (en) * | 2020-07-22 | 2020-10-02 | 惠州果颗科技有限公司 | Improved electric scissors convenient for heat dissipation |
US12064894B2 (en) | 2020-09-04 | 2024-08-20 | Milwaukee Electric Tool Corporation | Chainsaw |
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US6455186B1 (en) * | 1998-03-05 | 2002-09-24 | Black & Decker Inc. | Battery cooling system |
DE102006015664A1 (en) * | 2005-04-04 | 2007-01-25 | Hitachi Koki Co., Ltd. | Battery pack and wireless electrical tool having this |
GB0723914D0 (en) * | 2007-12-07 | 2008-01-23 | Johnson Electric Sa | A power tool |
DE102009012177A1 (en) * | 2009-02-27 | 2010-09-02 | Andreas Stihl Ag & Co. Kg | Battery operated, handheld electrical appliance |
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2011
- 2011-08-26 WO PCT/SE2011/051028 patent/WO2013032372A1/en active Application Filing
- 2011-08-26 EP EP11871729.7A patent/EP2747949B1/en active Active
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US20210299844A1 (en) * | 2018-08-31 | 2021-09-30 | Husqvarna Ab | Power tool |
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Publication number | Publication date |
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WO2013032372A1 (en) | 2013-03-07 |
EP2747949A4 (en) | 2015-03-25 |
EP2747949A1 (en) | 2014-07-02 |
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